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Finding the Fourth Proportional to 639,420.60, 957,867.30 and 414,937.20

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Solution

The fourth proportional to 639,420.60, 957,867.30 and 414,937.20 is: 621,585.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,420.60 : 957,867.30 = 414,937.20 : x
  2. Step 2: Convert to fraction form
    639,420.60/957,867.30 = 414,937.20/x
  3. Step 3: Cross multiply
    639,420.60x = 957,867.30 × 414,937.20
  4. Step 4: Simplify right side
    639,420.60x = 397,454,775,433.56
  5. Step 5: Solve for x
    x = 397,454,775,433.56/639,420.60
  6. Step 6: Final answer
    x = 621,585.82

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.